Old id Software #games, inluding the first three Doom and Quake games, are #FOSS under the GPL. My favorite FOSS game is currently the Hideous Destructor mod for Doom, which I stream somewhat regularly on my personal website. A lot of people talk about games like Xonotic and Red Eclipse being great free alternatives to Quake 3 without realizing that Quake 3 itself is free software
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